Nut-lock



(No Model.)

B. G. MILLER.

NUT LOOK. No. 287,041. Patented Oct. 23, 1883 @660 v M ,Zzz/erzzoiz' UNITED STATES BENJAMIN e. MILLER, or srnnn roa, ILLINOIS.

ATENT FFIcEa 1 NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 287,041, dated October 23, 1883.

Application filed April '7, 1883. (No model.)

To all whom it may concern.-

Be it known that I, BENJAMIN G. MILLER, a citizen of the United States, residing at Streator, in the county of La Salle and State of Illinois, have invented certain new and useful Improvements in Nut-Locks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertai ns to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in nut and bolt locks, and it consists in the construction of the nut and the device for locking the nut upon the screw-bolt, as will be fully hereinafter described.

In the drawings, Figure 1 is a View in perspective of the screw-bolt, the screw-nut, and the locking device. Fig. 2 represents the inner face of the nut, the screw-thread, and the locking-dog in position to lock the nut upon the screw-bolt. Fig. 3 is a view of the inner face of the nut, the screw-thread, and the locking-dog in position to allow freedom of revolution of the screw-bolt in either direction- Fig. 4 is a sectional view on line 1 of Fig. 2. Fig. 5 is a part sectional view of the screwbolt, and a sectional View of the nut and lockingdog on line 00 as of Fig. 3; and Fig. 6 repre sents the inner face of the nut, having the recess for the locking-dog, and the pivot upon which the locking-dog rotates, and the dog re moved to one side.

A represents an ordinary screw-bolt, with the head A,of any form desired, and the screwthreads a cut into the body of the bolt at the end opposite the head.

B represents the screw-nut, of any shape or form, with the bolt-hole B centrally through it, and screw-threads I) cut therein.

0 represents a recess in the face or clamping side of the nut, of such form'as will receive therein the locking-dog and allow the dog to rotate. This recess is of a depth in the face of the nut a little greater than the thickness of the locking-dog operating therein.

a is a pivot-pin in a hole bored through the nut, and upon which the locking-dog rotates and is held inplace in the recess of the nut.

D is thelockingdog, constructed in the form seen in Fig. 6, having the circular pivotal part (1, with the pivot-hole. d centrally therein, and the sharp projecting and penetrating edge d to enter into or indent in the screw-thread on the bolt, to prevent the backward rotation of the nut after it has been turned up to the holding point, and with an outwardlyprojecting lever end d. 'The screw-bolt and the screw-nut being in the ordinary form. the nut having the recess in its clamping-face t3 receive the locking-dog, and the dog in its place therein, the screw being right hand out threads, the lever or upper or outer end of the dog is turned over to the left against the wall of the recess, as seen in Fig. 3. The nut can now be screwed onto the bolt until its face is clamped upon or against what it is to hold. Then the lever end 61 of the dog is forced over to the right, when the sharp projecting edge 01' of the dog D will engage the screw-thread on the bolt,

and by strongly pressing upon the lever to the hold of the screw-thread that the harder you try to force the nut backward or to unscrew it the deeper it sinks into the metal of the bolt, thus completely looking it from any liability to become loose by any jarring orordinary force to turn the nut back. The same effect is produced in looking the nut by striking upon the lever with a hammer to force it over to the right, as such concussive blow will settle the edge d deeply into the screw-thread at once. Then by slightly turning the nut back the metal of the thread on the bolt will be jammed in such manner that the nut will be locked fast thereon. To unlock the nut with a wrench, turn the nut slightly forward or onto the bolt, when the lever can be turned back to the left, as it is seen in Fig. 3, and the nut is then free to be unscrewed from the bolt.

It is evident from the construction that the piv0tpin c is only necessary to hold the locking-dog to the nut when not in use, as all the Having thus described my invention ,what I screw-bolt A, substantially as shown and declaim, and desire to secure by Letters Patent, scribed. 7 10 is 7 In testimony whereof I afiix my signature in In a nut-lock, the screw-nut B, having the presence of two Witnesses. 5 recess 0 in its face, the dog D, having the cir- BENJAMIN G. MILLER.

oular part d, upon which it rotates in the re- Witnesses: oess, the sharp projecting edge or point 11, OSCAR B. RYON,

and the lever. end in combination With the DAVIS ATKINS. 

